There are multiple house items to represent the object used to hide the slain scholar's body, if you successfully solve the murder. The item will be in the final Scholar Primarch's chest if you were correct in your accusation.

Note: These clickable objects disappear shortly after being "collected." If all group-members click the item at same time and finish 'harvesting' before it disappears, they will all receive the item. This applies only to plundered furniture in The Shadow Odyssey expansion.

The banner is above the right hand shoulder of the goblin statue by the ramp. Stand on the boxes to reach it.NOTE: the banner will highlight and say you are too far away but you can still "Pull down the banner" (as the right-click menu states) and grab it.